These data were collected under a cooperative mapping program between the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration Coastal Services Center (NOAA\CSC), and the Apalachicola National Estuarine Research Reserve (NERR). The primary objectives of this program were to collect marine geophysical data to develop a suite of seafloor maps to better define the extent of oyster habitats, the overall seafloor geology of the bay and provide updated information for management of this resource. In addition to their value for management of the bay's oyster resources, the maps also provide a geologic framework for scientific research and the public.
High-resolution bathymetry, backscatter intensity, and seismic profile data were collected over 230 square kilometers of the floor of the bay. The study focused on the Apalachicola Bay and Western St. George Sound portions of the estuary in mostly in depths > 2.0 meters.

Purpose:

This shapefile represents the trackline along which seismic profile data collected aboard the R/V RAFAEL during USGS field activities 05001 and 06001 in Apalachicola Bay and St. George Sound, Florida. The seismic data that were collected from the R/V RAFAEL were acquired differently in 2005 than in 2006. During the first seven survey days of the 2005 field season (Julian days 076-083) a Knudsen 320 b chirp profiler (3.5-12 kHz) was used and during the remaining part of the 2005 season a towed Edgetech FSSB 424 (2-24 kHz) system was used. In 2006, the Edgetech FSSB 424 was used for the entire field season, but it was mounted on a pole rather than being towed on a cable. In 2005 both the Knudsen and Edgetech seismic data were logged in SEG-Y format using Delph Seismic +. In 2006 the Edgetech seismic data were logged in SEG-Y format using SBLogger. The purpose of these data is to manage the filenames and geographic locations of seismic profile images that are hyperlinked to each trackline.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20050314,20060529

Ending_Date: 20050413,20060627

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -85.095776

East_Bounding_Coordinate: -84.755209

North_Bounding_Coordinate: 29.782852

South_Bounding_Coordinate: 29.601378

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: Woods Hole Science Center

Theme_Keyword: WHSC

Theme_Keyword: Seafloor

Theme_Keyword: Marine Geology

Theme_Keyword: field activity serial number 05001

Theme_Keyword: field activity serial number 06001

Theme_Keyword: Seismic Profile

Theme_Keyword: navigation tracklines

Theme_Keyword: seismic navigation

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: oceans and estuaries

Theme_Keyword: transportation

Theme_Keyword: location

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Apalachicola Bay

Place_Keyword: Florida

Place_Keyword: Apalachicola National Estuarine Research Reserve

Place_Keyword: St. George Sound

Place_Keyword: United States

Place_Keyword: Gulf of Mexico

Stratum:

Stratum_Keyword_Thesaurus: General

Stratum_Keyword: Seafloor

Stratum_Keyword: Subsurface

Temporal:

Temporal_Keyword_Thesaurus: General

Temporal_Keyword: 2005

Temporal_Keyword: 2006

Access_Constraints: None

Use_Constraints:

These data should not be used at resolutions for which they are not intended.
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

RTK GPS was used to navigate the seismic-reflection systems. The GPS antenna was mounted over the bathymetric sonar and a layback of 4 meters was used for the seismics.

Completeness_Report:

Sections of tracklines where seismic data were not logged were deleted

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Navigation was recorded to all data acquisition systems using Real Time Kinematic GPS at a one second interval.
Horizontal accuracy of the navigation is assumed to be +/- 1 meter. The shot point file and survey line file for the
seismic data are both derived from the same navigation file that was logged by the seismic acquisition system, but
because the two were processed differently, the shot points do not always fall directly on the survey line. To create
the shot point file, the navigation was queried to extract every 500th point starting with shot point 500. By
contrast, to create the survey line file, the navigation was queried at a one minute interval (every 60th point), and
then a line was drawn using these points. Because of the different processing approaches, many of the shot points,
although close, do not fall exactly on the survey line. If meter accuracy is truely needed, it would be best to
extract the navigation from the archived SEG-Y seismic files.

Lineage:

Process_Step:

Process_Description:

The seismic data that were collected from the R/V RAFAEL were acquired differently in 2005 than in 2006. During the first seven survey days of the 2005 field season (Julian days 076-083) a Knudsen 320 b chirp profiler (3.5-12 kHz) was used and during the remaining part of the 2005 season a towed Edgetech FSSB 424 (2-24 kHz) system was used. In 2006, the Edgetech FSSB 424 was used for the entire field season, but it was mounted on a pole rather than being towed on a cable. In 2005 both the Knudsen and Edgetech seismic data were logged in SEG-Y format using Delph Seismic +. In 2006 the Edgetech seismic data were logged in SEG-Y format using SBLogger. Navigation was extracted from the raw SEG-Y format seismic data and converted to an ASCII text file. The ASCII navigation file was downsampled to a one minute interval, and then imported to ArcGIS using the AddXYdata tool in ArcMap (v. 9.2). The points then were converted to a line using an ArcMap script Points_to_Line v2 developed at the USGS by VeeAnn Cross.

Process_Date: 20070505

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Brian Andrews

Contact_Organization: U.S. Geological Survey

Contact_Position: Geographer

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: 508-548-8700 x2348

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: bandrews@usgs.gov

Process_Step:

Process_Description:

Exported feature class from personal geodatabase to a shapefile and projected to geographic.

Process_Date: 200707

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Brian Andrews

Contact_Organization: U. S. Geological Survey

Contact_Position: Geographer

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Road

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x 2348

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: bandrews@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 717

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: SeismicLines

Entity_Type_Definition:

Navigation lines for seismic-reflection data collected during USGS field activities 06001 and 05001

Entity_Type_Definition_Source: USGS

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FeatureID

Attribute_Definition: Not used

Attribute_Definition_Source: ArcMarine

Attribute:

Attribute_Label: FeatureCod

Attribute_Definition: not used

Attribute:

Attribute_Label: LineName

Attribute_Definition: name of survey line assigned for identification purposes

Attribute_Definition_Source: USGS

Attribute:

Attribute_Label: JDay

Attribute_Definition: Julian Day the data were collected

Attribute_Definition_Source: USGS

Attribute:

Attribute_Label: ImageTitle

Attribute_Definition:

Name of seismic profile image that coincides with the survey line. The LineName and ImageTitle are the same.

Attribute_Definition_Source: USGS

Attribute:

Attribute_Label: SurveyID

Attribute_Definition:

ID used to identify the survey during which the data were collected. It is also used as join field with SurveyInfo Table for relationship class

Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Access_Instructions: Data can be downloaded via the World Wide Web (WWW)

Offline_Option:

Offline_Media: DVD-ROM

Recording_Capacity:

Recording_Density: 4.75

Recording_Density_Units: Gbytes

Recording_Format: UDF

Technical_Prerequisites:

The data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.3 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.